Fixes #2782.  The brtloader uses temp dir.   Note however that #2783 isn't fixed yet. close[t:2782].

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 * That's 2/3 of 3/4, which is calculated as 1/4 is unreservable.  The loader asks for 2/3 of what's reservable, getting one half.
The second loader gets 1/6 of cachetable memory.
 * That's 2/3 of 1/4: The loader asks for 2/3 of what's reservable.  1/2 has been reserved.  1/4 is unreservable.  1/4 is reservable.  2/3 of 1/4 is 1/6.
The third loader gets 1/18 of cachetable memory. 
 * That's 2/3 or 1/12.   (1/4 is unreservable. 1/2 was reserved by the first loader.  1/6 by the second.  That leaves 1/12)
Generally the next one gets 1/3 of what the previous one got.

Refs #2759. [t:2759]


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{{{
svn merge -r21499:21502 https://svn.tokutek.com/tokudb/toku/tokudb.2755
}}}
.


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Candidate fix for #2730 (the race in the loader and the io-thread where they glare at each other).  Refs #2730. [t:2730]

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[t:2721] Add -k option to loader-cleanup-test to test only abort-via-poll, but test it exhaustively for any size database.


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[t:2721] Improve loader-cleanup-test to return non-zero from polling function for different cases (first time, second time, etc., just like error injection).

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dbt.size should be length of string, not size of pointer

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Need an extra test for {{{loader-stress-test.loader}}} in the {{{Makefile}}} to manifest #2717.  Refs #2717. [t:2717]

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Fix the cachetable-race so that it doesn't run in BDB and compiles under windows. Fixes #2699, #2698. close[t:2699] close[t:2698].

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Technically neither one causes any problems.

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